1609716449 has 4 divisors (see below), whose sum is σ = 1756054320. Its totient is φ = 1463378580.

The previous prime is 1609716431. The next prime is 1609716517. The reversal of 1609716449 is 9446179061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1609716449 - 2²⁰ = 1608667873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1609710449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73168919 + ... + 73168940.

It is an arithmetic number, because the mean of its divisors is an integer number (439013580).

Almost surely, 2^1609716449 is an apocalyptic number.

It is an amenable number.

1609716449 is a deficient number, since it is larger than the sum of its proper divisors (146337871).

1609716449 is a wasteful number, since it uses less digits than its factorization.

1609716449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146337870.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1609716449 is about 40121.2717769514. The cubic root of 1609716449 is about 1171.9699078751.

The spelling of 1609716449 in words is "one billion, six hundred nine million, seven hundred sixteen thousand, four hundred forty-nine".